<span>одно число 2х+1, а второе 2х+3. Их сумма 4х+4. Делится на 4</span>
(5,2 * 10^(-3)) * (4.4*10^4) =
= 5.2*4.4 * 10^(-3+4) = 22.88 * 10^1
<span>0.6<span>x2</span> - 3.6x = 0</span>
<span><span>D = (-3.6)2 - 4·(0.6)·0</span> = 12.96</span>
<span><span><span>x1 = </span><span>3.6 - √12.96 /</span> 0</span>2·(0.6)=0</span>
<span><span><span>x2 = </span><span>3.6 + √12.96</span> /</span><span>2·(0.6) = 6
</span></span>
7xa-7xb=7x*a-7x*b=7x(a-b)
Ручка-x
блокнот-y
{4y+3x=90|*2
{3y-2x=25|*3
+{6x+8y=180
+{-6x+9y=75
17y=255|:17
y=15
3*15-2x=25
-2x=25-45
-2x=-20|:(-2)
x=10